mirror of
https://github.com/photonstorm/phaser
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117 lines
3.9 KiB
JavaScript
117 lines
3.9 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2015 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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/**
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* The Crop component provides the ability to crop a texture based Game Object to a defined rectangle,
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* which can be updated in real-time.
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*
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* @class
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*/
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Phaser.Component.Crop = function () {};
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Phaser.Component.Crop.prototype = {
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/**
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* The Rectangle used to crop the texture this Game Object uses.
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* Set this property via `crop`.
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* If you modify this property directly you must call `updateCrop` in order to have the change take effect.
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* @property {Phaser.Rectangle} cropRect
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* @default
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*/
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cropRect: null,
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/**
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* @property {Phaser.Rectangle} _crop - Internal cache var.
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* @private
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*/
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_crop: null,
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/**
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* Crop allows you to crop the texture being used to display this Game Object.
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* Setting a crop rectangle modifies the core texture frame. The Game Object width and height properties will be adjusted accordingly.
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*
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* Cropping takes place from the top-left and can be modified in real-time either by providing an updated rectangle object to this method,
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* or by modifying `cropRect` property directly and then calling `updateCrop`.
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*
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* The rectangle object given to this method can be either a `Phaser.Rectangle` or any other object
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* so long as it has public `x`, `y`, `width`, `height`, `right` and `bottom` properties.
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*
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* A reference to the rectangle is stored in `cropRect` unless the `copy` parameter is `true`,
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* in which case the values are duplicated to a local object.
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*
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* @method
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* @param {Phaser.Rectangle} rect - The Rectangle used during cropping. Pass null or no parameters to clear a previously set crop rectangle.
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* @param {boolean} [copy=false] - If false `cropRect` will be stored as a reference to the given rect. If true it will copy the rect values into a local Phaser Rectangle object stored in cropRect.
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*/
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crop: function(rect, copy) {
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if (typeof copy === 'undefined') { copy = false; }
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if (rect)
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{
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if (copy && this.cropRect !== null)
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{
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this.cropRect.setTo(rect.x, rect.y, rect.width, rect.height);
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}
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else if (copy && this.cropRect === null)
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{
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this.cropRect = new Phaser.Rectangle(rect.x, rect.y, rect.width, rect.height);
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}
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else
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{
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this.cropRect = rect;
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}
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this.updateCrop();
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}
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else
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{
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this._crop = null;
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this.cropRect = null;
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this.resetFrame();
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}
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},
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/**
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* If you have set a crop rectangle on this Game Object via `crop` and since modified the `cropRect` property,
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* or the rectangle it references, then you need to update the crop frame by calling this method.
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*
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* @method
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*/
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updateCrop: function() {
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if (!this.cropRect)
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{
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return;
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}
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this._crop = Phaser.Rectangle.clone(this.cropRect, this._crop);
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this._crop.x += this._frame.x;
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this._crop.y += this._frame.y;
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var cx = Math.max(this._frame.x, this._crop.x);
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var cy = Math.max(this._frame.y, this._crop.y);
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var cw = Math.min(this._frame.right, this._crop.right) - cx;
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var ch = Math.min(this._frame.bottom, this._crop.bottom) - cy;
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this.texture.crop.x = cx;
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this.texture.crop.y = cy;
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this.texture.crop.width = cw;
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this.texture.crop.height = ch;
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this.texture.frame.width = Math.min(cw, this.cropRect.width);
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this.texture.frame.height = Math.min(ch, this.cropRect.height);
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this.texture.width = this.texture.frame.width;
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this.texture.height = this.texture.frame.height;
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this.texture._updateUvs();
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}
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};
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